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Table 2 Cluster validity indices

From: Building stock market resilience through digital transformation: using Google trends to analyze the impact of COVID-19 pandemic

CVIs

Literature

Evaluation criteria

Silhouette (Sil)

Rousseeuw (1987)

Maximized

Score Function (SF)

Saitta et al. (2007)

Maximized

Calinski-Harabasz (CH)

Arbelaitz et al. (2013)

Maximized

Davies-Bouldin (DB)

Arbelaitz et al. (2013)

Minimized

Modified Davies-Bouldin (DBstar)

Kim and Ramakrishna (2005)

Minimized

COP

Arbelaitz et al. (2013)

Minimized